JP2011230410A - Liquid droplet ejection head and liquid droplet ejection apparatus with the same - Google Patents

Abstract

An object of the present invention is to provide an ink jet head having an ink pressure chamber having a plurality of nozzles, wherein the amount of each ink droplet ejected from the plurality of nozzles is uniform. A coating film having a uniform film thickness is formed using the inkjet head.
An ink pressure chamber having a plurality of nozzles, a supply channel through which ink supplied to the ink pressure chamber flows, a discharge channel through which ink discharged from the ink pressure chamber flows, and the ink pressure chamber A plurality of nozzles of the ink pressure chamber are not the same, and the ink pressure applied by the piezo element is large. A droplet discharge head in which the diameter of the nozzle is smaller than the diameter of the other nozzle or the diameter of the nozzle in the region where the ink pressure applied by the piezo element is small is larger than the diameter of the other nozzle.
[Selection] Figure 2

Description

  The present invention relates to a droplet discharge head and a droplet discharge device including the droplet discharge head, typically an inkjet device.

  An ink jet head of an ink jet apparatus is disposed in each of an ink supply channel to which ink is supplied from an ink supply source; a plurality of ink pressure chambers communicating with the ink supply channel and having nozzles; And an actuator (for example, a piezo element). When the actuator applies pressure to the ink in the ink pressure chamber, the ink is ejected as droplets from the nozzle.

  Ink jet heads include a type that circulates ink and a type that does not circulate ink. An ink jet head that circulates ink has an ink discharge channel communicating with an ink pressure chamber. A part of the ink supplied from the ink supply channel to the ink pressure chamber is ejected from the nozzle, but the remaining part is discharged to the ink discharge channel and collected by the ink supply source (see Patent Document 1). In an ink jet head that circulates ink, air mixing into the ink and nozzle clogging can be reduced.

  In addition, although the number of nozzles included in one ink pressure chamber is usually one, it is also proposed to use a plurality of nozzles (see, for example, Patent Document 2). Specifically, as shown in FIG. 6, an ink supply flow path 19; an ink pressure chamber 18; a single pressure generator 12 including a piezoelectric element 15 and a piston 16; and a plurality of nozzles 13 formed on the nozzle plate 13. An inkjet head 1 having a nozzle 20 is proposed. If a plurality of nozzles are arranged in one ink pressure chamber, the number of actuators can be reduced with respect to the number of nozzles, so that the manufacturing cost can be reduced.

JP 2008-254196 A JP 2000-177121 A

  In recent years, attempts have been made to form a coating film with higher film thickness uniformity using an inkjet apparatus. For example, an attempt has been made to form an organic functional layer of an organic EL display panel with an ink jet apparatus. In order to form a coating film with high film thickness uniformity, it is necessary to increase the landing density of ink droplets ejected from an inkjet head. If the landing density of the ink droplets is low, the ink solvent dries before the landed ink liquid enemies combine to form a leveled film, so a coating film with high film thickness uniformity cannot be obtained. . In particular, when the viscosity of the ink is high, the solute concentration in the ink is high, or the volatility of the solvent contained in the ink is high, the film thickness uniformity of the coating film tends to decrease.

  In order to increase the landing density of the ink droplets, it is necessary to increase the arrangement density of the nozzles of the inkjet head, that is, to reduce the interval between the nozzles. In order to reduce the interval between the nozzles, it is conceivable to increase the arrangement density of the ink pressure chambers in the ink jet head, but the number of ink pressure chambers that can be arranged in the ink jet head is limited. Accordingly, it is conceivable to increase the nozzle arrangement density by arranging a plurality of nozzles in each ink pressure chamber.

  However, when a plurality of nozzles are arranged in the ink pressure chamber, the amount of ink droplets ejected from each nozzle may be uneven. If the amount of ink droplets becomes non-uniform, even if the landing density of ink droplets is increased, the film thickness uniformity of the coating film cannot be sufficiently increased.

  Accordingly, the present invention provides a droplet discharge head (such as an ink jet head) having an ink pressure chamber having a plurality of nozzles, wherein the amount of each ink droplet discharged from the plurality of nozzles is made uniform. The object is to provide a head. And it aims at forming a coating film with high film thickness uniformity by using the droplet discharge apparatus provided with it.

  The present inventor has found that the amount of ink droplets ejected from a plurality of nozzles arranged in the ink pressure chamber of the droplet ejection head is uneven because the pressure by the actuator arranged in the ink pressure chamber is It was noted that this was because the ink was not uniformly applied to the ink in the pressure chamber. Therefore, the nozzle diameter in the area where the pressure by the actuator is easy to be applied is made smaller than the diameter of other nozzles, or the nozzle diameter in the area where the pressure by the actuator is difficult to be applied is smaller than the diameter of other nozzles. Was also bigger. Thereby, the amount of ink droplets discharged from each nozzle was made uniform. That is, the present invention relates to a droplet discharge head described below and a droplet discharge apparatus including the same.

[1] An ink pressure chamber having a plurality of nozzles for ejecting ink droplets, a supply channel through which ink supplied to the ink pressure chamber flows, and a discharge flow through which ink discharged from the ink pressure chamber flows A droplet discharge head having a path and a piezo element that applies pressure to ink in the ink pressure chamber,
All the nozzle diameters of the plurality of nozzles included in the ink pressure chamber are not the same, and the nozzle diameter of the area where the ink pressure applied by the piezo element is large is smaller than the diameters of the other nozzles, or by the piezo element. A droplet discharge head in which the nozzle diameter of the region where the applied ink pressure is small is larger than the diameter of the other nozzles.
[2] The piezo element has a surface that expands and contracts toward an arrangement surface of the plurality of nozzles, and the expansion and contraction amount of the surface that expands and contracts is distributed.
The droplet discharge head according to [1], wherein the diameter of the nozzle closest to the portion with the largest expansion / contraction amount among the expansion / contraction surfaces of the piezo element is smaller than the diameters of the other nozzles.
[3] The piezo element does not have a surface that expands and contracts toward the arrangement surface of the plurality of nozzles, and the diameter of the nozzle closest to the discharge channel among the plurality of nozzles is the diameter of another nozzle. The droplet discharge head according to [1], wherein the droplet discharge head is larger.
[4] A droplet discharge apparatus comprising the droplet discharge head according to any one of [1] to [3].

  By using a droplet discharge device including the droplet discharge head (typically, an inkjet head) of the present invention, a coating film with high film thickness uniformity can be formed. In particular, the effect of the present invention is effectively exhibited when ink having high viscosity, high density ink, or ink containing a highly volatile solvent is ejected. Therefore, the droplet discharge device of the present invention is effectively used for forming an organic functional layer (such as an organic light emitting layer) of an organic EL display panel.

It is a figure which shows typically a circulation type droplet discharge apparatus. It is a figure which shows the droplet discharge apparatus of Embodiment 1 of this invention. It is a figure which shows the droplet discharge apparatus of Embodiment 1 of this invention. It is a figure which shows the droplet discharge apparatus of Embodiment 2 of this invention. A graph (FIG. 5A) showing the displacement distribution of the movable end face of the piezo element, a graph (FIG. 5B) showing the relationship between the displacement and the generated pressure, and a graph (FIG. 5C) showing the relationship between the nozzle diameter and the discharge pressure. is there. It is an example of the conventional inkjet head which comprises the ink pressure chamber which has a some nozzle.

About the droplet discharge head The droplet discharge head of the present invention includes an ink pressure chamber in which nozzles are arranged, an ink supply channel, an ink discharge channel, and a piezo element. Ink is supplied from the ink supply channel to the ink pressure chamber, a part of the supplied ink is discharged from the nozzle, and the remaining portion is discharged to the ink discharge channel. Thus, the droplet discharge head of the present invention is a so-called circulation type droplet discharge head of a type in which ink circulates. It is preferable that a plurality of ink pressure chambers communicate in parallel with the ink supply channel and the ink discharge channel.

  The piezo element disposed in the ink pressure chamber can expand and contract to change the volume of the ink pressure chamber and apply pressure to the ink in the ink pressure chamber. A piezo element is an element that contracts when a voltage is applied. Piezo elements can be classified into thin film piezo elements and bulk piezo elements. Any of the piezo elements included in the ink jet head of the present invention may be used, but in the case of discharging high viscosity ink, it is preferable to use a bulk piezo element. This is because the ejection force due to the bulk piezoelectric element is larger than the ejection force due to the thin film piezoelectric element. The number of piezoelectric elements arranged in the ink pressure chamber may be one or two or more.

  The ink supplied from the ink supply channel to the ink pressure chamber receives pressure due to expansion and contraction of the piezo element, and a part of the ink is ejected through the nozzle. Ink that is not ejected is discharged to the ink discharge channel.

  FIG. 1 is a diagram schematically showing a circulation type droplet discharge head. A droplet discharge head 10 shown in FIG. 1 includes an ink supply channel 100, an ink discharge channel 110, and a plurality of ink pressure chambers 120 (120A to 120C). Ink is supplied from the ink supply channel 100 to each ink pressure chamber 120 through each connection channel 160. Ink is discharged from each ink pressure chamber 120 to the ink discharge channel 110 through each connection channel 170.

  In each ink pressure chamber 120, a nozzle 140 (140A to C) and a piezo element 130 (130A to C) are arranged. In the droplet discharge head 10 of the present invention, the number of nozzles 140 disposed in each ink pressure chamber 120 is plural, and the diameters of the plurality of nozzles 140 differ depending on the arrangement mode of the piezo elements 130. And features.

  As described above, a plurality of nozzles are arranged in the ink pressure chamber of the droplet discharge head of the present invention. Usually, the number of nozzles arranged in one ink pressure chamber is 2 to 100, but is not particularly limited. Compared with the case where one nozzle is provided in each ink pressure chamber, the interval between the nozzles can be shortened when a plurality of nozzles are provided. That is, the landing density of the ink droplets on the application surface can be increased. If the landing density of ink droplets can be increased, a uniform coating film can be easily formed on the coating surface.

  That is, if the landing density of the ink droplets on the coating surface is low, the time required for the landed ink droplets to level and form a uniform coating film becomes long. For this reason, the solvent in the ink volatilizes before leveling, and a uniform coating film cannot be obtained. On the other hand, if the landing density of ink droplets on the application surface is high, the time required for leveling the ink droplets that have landed to form a uniform coating film is short, so the solvent in the ink volatilizes. Leveling is realized before the coating, and a uniform coating film is obtained.

  Thus, the droplet discharge head of the present invention can form a uniform coating film even if the solvent of the ink is a solvent that is relatively easy to dry. Solvents that are relatively easy to dry often have a relatively low viscosity. Therefore, the ink of the droplet discharge head of the present invention can be easily reduced in viscosity by a solvent even if the concentration of the solute is high or the viscosity of the solute is high.

  As described above, when a plurality of nozzles are arranged in each ink pressure chamber, the landing density of ink droplets is high, and thereby a uniform coating film can be formed. However, even if the landing density of ink droplets is high, it is difficult to form a uniform coating film if the volume of ink droplets ejected from each nozzle varies. The ink supplied to the ink pressure chamber receives pressure due to expansion and contraction of the piezo element, and is ejected as droplets from each nozzle. If the entire ink in the ink pressure chamber receives a uniform pressure, it is possible to make the amount of ink droplets ejected from each nozzle constant by making the diameter of each nozzle constant. However, it has been found that if a plurality of nozzles are provided in the ink pressure chamber and the diameters of the plurality of nozzles are made constant, the discharged ink droplets vary.

  It has been found that the cause is that the pressure due to expansion and contraction of the piezo element is not uniformly transmitted to the ink in the ink pressure chamber (details will be described later). That is, since non-uniform pressure is applied to the ink in the ink pressure chamber, the pressure applied to the ink in the vicinity of each nozzle is also different. For this reason, when the diameters of the plurality of nozzles arranged in the ink pressure chamber are the same, the volumes of ink droplets ejected from the nozzles are not the same.

  Therefore, the present invention is characterized in that the diameters of the plurality of nozzles are different from each other mainly in accordance with the arrangement of the piezo elements in the ink pressure chamber of the ink jet head. In other words, among the inks in the ink pressure chamber, the diameter of the nozzle that ejects ink that is susceptible to pressure due to expansion and contraction of the piezo element is reduced; Thus, the volume of ink droplets ejected from each nozzle is made constant.

  The nozzle diameter of the ink pressure chamber is appropriately set according to the volume of ink droplets to be ejected, but can usually be set within a range of 10 to 100 μm. Of the plurality of nozzles arranged in the ink pressure chamber, the nozzle diameter having the largest diameter is preferably 1.2 times or more the nozzle diameter having the smallest diameter.

  Hereinafter, setting of the diameters of the plurality of nozzles arranged in the ink pressure chamber will be specifically described.

[Embodiment 1]
The first cause of the non-uniform pressure applied to the ink in the ink pressure chamber is that the expansion / contraction part of the piezo element has a distribution (variation) without expanding / contracting uniformly. In other words, the piezo element expands and contracts an end surface called a movable end (also referred to as a movable end surface), but the entire movable end surface does not expand and contract uniformly, but has a distribution in the amount of expansion and contraction.

  FIG. 5A shows the displacement distribution of the movable end face of the piezo element. The X axis of the graph of FIG. 5A indicates the position on the movable end surface of the piezo element. Here, the diameter of the movable end face of the piezo element is 1500 μm. The vicinity of 0 μm and 1500 μm on the X axis corresponds to the end of the movable end surface. The Y axis of the graph represents the displacement rate of the movable end face of the piezo element. The displacement rate means the ratio of the expansion / contraction amount to the maximum value of the expansion / contraction amount of the movable end surface of the piezo element. As shown in FIG. 5A, it can be seen that the amount of expansion / contraction at the end of the movable end surface is smaller than the amount of expansion / contraction at the center of the movable end surface. Depending on the structure of the piezo element, the amount of expansion / contraction at the central portion of the movable end surface does not necessarily increase and the end portion does not decrease, but in any case, it is difficult to uniformly expand / contract the entire movable end surface.

  FIG. 5B is a graph showing the relationship between the displacement (expansion / contraction) amount (X axis) of the movable end surface of the piezoelectric element and the pressure (Y axis) generated thereby. It can be seen that the greater the amount of displacement, the greater the resulting pressure. For this reason, it is easy to eject ink from the nozzles in the movable end surface, where the pressure is easily received by the movable end surface having a large displacement, and the volume of the ejected ink droplets tends to increase. On the other hand, it is difficult for ink to be ejected from a nozzle in a region where the pressure due to the movable end surface with a small amount of expansion and contraction is small, and the volume of ejected ink droplets tends to be small. Therefore, when the diameters of the plurality of nozzles arranged in each ink pressure chamber are constant, the volume of ink droplets ejected from the nozzles differs depending on the nozzle arrangement position.

  FIG. 5C is a graph showing the relationship between the nozzle diameter (X axis) and the pressure (Y axis) required for ejecting a certain amount of ink. As shown in FIG. 5C, it can be seen that when the nozzle diameter is small, the pressure required to eject a certain amount of ink is high.

  Therefore, in the liquid droplet ejection head according to the first aspect of the present invention, the piezo element arranged in the ink pressure chamber has a surface (movable end surface) that expands and contracts toward the arrangement surface of the plurality of nozzles, and Of the surface (movable end surface) of the piezo element that expands and contracts, the nozzle diameter closest to the portion with the largest expansion / contraction amount is smaller than the diameters of the other nozzles. That is, in the movable end surface, the ink in the vicinity of the nozzle closest to the portion where the expansion / contraction amount of the piezo element is maximum is likely to be subjected to the largest pressure, so the ink capacity discharged as droplets by reducing the nozzle diameter. Suppress.

  2A and 2B schematically show the droplet discharge head 10-1 according to Embodiment 1 of the present invention. 2A is a cross-sectional view of the droplet discharge head 10-1; FIG. 2B is a perspective top view of the droplet discharge head 10-1. The droplet discharge head 10-1 in FIG. 2A includes an ink supply channel 100, an ink pressure chamber 120, and an ink discharge channel 110. Similar to the droplet discharge head 10 shown in FIG. 1, the droplet discharge head 10-1 includes a plurality of ink pressure chambers 120 communicating in parallel with the ink supply channel 100 and the ink discharge channel 110. Have. The dotted arrows in FIG. 2A indicate the flow of ink.

  A piezo element 130 is disposed in the ink pressure chamber 120, and a plurality of nozzles 140 (140-1 to 140-3) are formed. The movable end surface 131 of the piezo element 130 can be displaced toward the surface on which the nozzle 140 is formed. Ink that receives pressure due to the displacement is ejected as ink droplets 200 (200-1 to 200-3) through the nozzles 140 and landed on the coating surface of the substrate 300. A region to be a coating surface of the substrate 300 may be defined by a bank (partition wall) 310.

  As described above, the movable end surface 131 of the piezoelectric element 130 is not uniformly displaced. As shown in FIG. 2A, for example, the displacement amount of the central portion of the movable end surface 131 is large, and the displacement amount of the end portion of the movable end surface 131 is small (see solid arrow).

  Therefore, as shown in FIG. 2A and FIG. 2B, the diameter of the nozzle 140-2 near the center of the movable end surface 131 is reduced, and the diameters of the nozzles 140-1 and 140-3 near the end of the movable end surface 131 are reduced. It is getting bigger. In this way, since the diameter of the nozzle 140-2 in the region where the discharge pressure is high is reduced, the volume of the ink droplet 200 discharged from each nozzle 140 is made uniform.

  Similar to the droplet discharge head 10-1 shown in FIG. 2, the droplet discharge head 10-2 shown in FIG. 3A also has a smaller diameter of the nozzle 140-2 near the central portion of the movable end surface 131 of the piezo element 130. In addition, the diameters of the nozzles 140-1 and 140-3 near the end of the movable end surface 131 are increased. However, the nozzle diameters of the nozzles 140-1 and 140-3 are gradually reduced from the ink pressure chamber 120 side toward the outside. Therefore, the external diameters of the nozzles 140-1 to 140-3 are the same; the internal diameter of the nozzle 140-2 (the diameter on the ink pressure chamber 120 side) is larger than the internal diameters of the nozzles 140-1 and 140-3. small.

  As shown in FIG. 3A, the capacity of the ink droplets 200 ejected from each nozzle 140 can be made uniform even by adjusting only the inner diameter of each nozzle 140.

  Similarly to the droplet discharge head 10-1 shown in FIG. 2, the droplet discharge head 10-3 shown in FIG. 3B also has a small diameter of the nozzle 140-2 near the central portion of the movable end surface 131 of the piezo element 130. In addition, the diameters of the nozzles 140-1 and 140-3 near the end of the movable end surface 131 are increased. Further, by tilting the nozzles 140-1 and 140-3, not only the volume of the ejected ink droplet 200 can be made uniform, but also the ejection angle of the ejected ink droplet 200 can be adjusted. .

  When the movable end surface 131 of the piezo element 130 is displaced, a pressure is generated from the center portion to the end portion of the movable end surface 131 (see the wavy arrow in FIG. 3B). Therefore, the ink droplets 200 from the nozzle 140-1 and the nozzle 140-3 also try to be ejected outward. Therefore, as shown in FIG. 3B, the center lines of the nozzle 140-1 and the nozzle 140-3 are inclined inward. Thereby, the ejection direction of the ink droplet 200 to be ejected toward the outside is corrected to the inside.

[Embodiment 2]
The second cause of the uneven pressure applied to the ink in the ink pressure chamber of the droplet discharge head is due to the flow of ink in the ink pressure chamber. That is, the flow of ink in the area near the supply flow path and the area near the discharge flow path in the ink pressure chamber becomes faster. Therefore, the pressure by the piezo element is not easily transmitted to the ink in the vicinity of the nozzles arranged near the supply channel or the discharge channel. Therefore, even when the piezo element is displaced, the pressure for discharging from the nozzle is not easily transmitted to the ink. Accordingly, the volume of ink droplets ejected from the nozzle is reduced.

  Therefore, in the liquid droplet ejection head according to the second aspect of the present invention, a plurality of nozzles are arranged in each ink pressure chamber, and the diameter of the nozzle closest to the ink discharge channel is made larger than the other nozzles. As a result, the ink in the region where the pressure by the piezo element is not easily transmitted to the ink as the force for ejecting from the nozzle (ink close to the ink discharge channel) is easily ejected, and the ink droplets ejected from each nozzle The capacity is made uniform.

  FIG. 4 schematically shows a droplet discharge head 10-4 according to the second embodiment of the present invention. The droplet discharge head 10-4 shown in FIG. 4 includes an ink supply channel 100, an ink discharge channel 110, and an ink pressure chamber 120. Similarly to the droplet discharge head 10 shown in FIG. 1, the droplet discharge head 10-4 has a plurality of ink pressure chambers 120 communicating with the ink supply channel 100 and the ink discharge channel 110. Dotted arrows indicate ink flow.

  In the ink pressure chamber 120, a piezo element 130 is disposed, and a plurality of nozzles 140 (140-1 to 140-3) are formed. The movable end surface 131 of the piezo element 130 can apply pressure to the ink inside the ink pressure chamber 120 by displacement, but does not need to be displaced toward the surface on which the nozzle 140 is formed.

  Of the plurality of nozzles 140, the nozzle 140-1 is closest to the ink discharge channel 110. The ink in the vicinity of the nozzle 140-1 is subjected to a force that is discharged to the ink discharge channel 110. Therefore, when pressure is applied to the ink inside the ink pressure chamber 120 due to the displacement of the movable end surface 131 of the piezo element 130, pressure for appropriately discharging is applied to the ink in the vicinity of the nozzle 140-2 and the nozzle 140-3. However, it is difficult to apply sufficient pressure to the ink in the vicinity of the nozzle 140-1.

  Therefore, in the droplet discharge head shown in FIG. 4, the diameter of the nozzle 140-1 is made larger than the diameters of the nozzle 140-2 and the nozzle 140-3. As a result, the ink droplet 200-1 from the nozzle 140-1 can be easily discharged, and the capacity of the ink droplet 200-1 is increased even with a low discharge pressure. Thereby, the volume of each ink droplet 200 (200-1 to 200-3) discharged from each nozzle 140 is made uniform.

About the droplet discharge device The droplet discharge device of the present invention is characterized by including the above-described ink discharge head, but otherwise has the same configuration as a conventional droplet discharge device, that is, an inkjet head. sell. For example, it includes a member for fixing the droplet discharge head, a moving stage for mounting and moving an object to which ink is applied.

  The droplet discharge device of the present invention includes an ink circulation device for circulating the ink of the droplet discharge head. The ink is circulated by a driving pressure of a pump or the like, but is preferably circulated through a circulation tank so that the supply pressure is constant. The droplet discharge device may continuously circulate the ink of the droplet discharge head during operation of the device; it may circulate intermittently.

  By using the droplet discharge device having the droplet discharge head of the present invention, it is possible to make the volume of ink droplets discharged from each nozzle uniform while increasing the landing density of ink droplets. A coating film with high thickness uniformity can be formed. Therefore, the droplet discharge device of the present invention is useful for coating and forming an organic light emitting layer of an organic light emitting display that requires a high degree of film thickness uniformity, for example.

DESCRIPTION OF SYMBOLS 1 Inkjet head 12 Pressure generator 13 Nozzle plate 15 Piezoelectric element 16 Piston 18 Ink pressure chamber 19 Ink supply flow path 20 Nozzle 10, 10-1 to 10-4 Droplet discharge head 100 Ink supply flow path 110 Ink discharge flow path 120 , 120A-C Ink pressure chamber 130, 130A-C Piezo element 131 Movable end surface 140, 140A-C Nozzle 160, 160A-C Connection flow path 170, 170A-C Connection flow path 200 Ink droplet 300 Substrate 310 Bank (partition wall)

Claims (4)

An ink pressure chamber having a plurality of nozzles for ejecting ink droplets, a supply channel through which ink supplied to the ink pressure chamber flows, a discharge channel through which ink discharged from the ink pressure chamber flows, A piezo element that applies pressure to the ink in the ink pressure chamber;
The diameters of the plurality of nozzles of the ink pressure chamber are not the same,
The nozzle diameter in the region where the ink pressure applied by the piezo element is large is smaller than the diameter of the other nozzle, or the nozzle diameter in the region where the ink pressure applied by the piezo element is small is the diameter of the other nozzle. Larger than the droplet discharge head. The piezo element has a surface that expands and contracts toward an arrangement surface of the plurality of nozzles, and the expansion amount of the surface that expands and contracts has a distribution,
2. The droplet discharge head according to claim 1, wherein a nozzle diameter closest to a portion having the largest expansion / contraction amount among the expansion / contraction surfaces of the piezoelectric element is smaller than the diameters of the other nozzles. The piezo element does not have a surface that expands and contracts toward an arrangement surface of the plurality of nozzles,
2. The droplet discharge head according to claim 1, wherein a diameter of a nozzle closest to the discharge channel among the plurality of nozzles is larger than a diameter of another nozzle. A droplet discharge apparatus comprising the droplet discharge head according to claim 1.

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